题目：On an average, people in America who were born in 1900 ______.A．had a life-span of 74 year
On an average, people in America who were born in 1900 ______.
A．had a life-span of 74 years
B．lived a shorter but better life than those born later
C．lived to 47 years of age
D．lived 27 years longer than those born in 1981
